Hydrogen Selective Gas Detector for Utility and Swamp Gas Discrimination

Solution Overview

Problem

Current methods for distinguishing between utility gas leaks and swamp gas during underground leak surveys are slow and unreliable, primarily due to the lack of affordable and selective sensors that can accurately measure methane and ethane in real time, often requiring time-consuming sample collection and laboratory analysis.

Innovation Solution

Employing a highly sensitive hydrogen selective gas detector that is several orders of magnitude more sensitive to hydrogen than methane, allowing for the differentiation between utility gas and swamp gas by measuring hydrogen levels in the gas sample, which are typically higher in swamp gas.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If gas chromatograph analysis is used to distinguish between utility gas and swamp gas by measuring ethane content, then discrimination accuracy is improved, but test time increases to 30 minutes or more

Engineering Contradiction:

Improvediscrimination accuracyVSAvoidtest time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The invention extracts and measures only the hydrogen component of the gas sample using a selective hydrogen sensor, rather than performing complete chromatographic separation and analysis of all gas components. This selective extraction of the key discriminative component (hydrogen) enables rapid measurement without the time-consuming full analysis process, directly resolving the contradiction between accuracy and speed.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces the mechanical/chromatographic separation system with a selective chemical sensor system. Instead of using a gas chromatograph to physically separate and detect ethane, the patent uses a hydrogen-selective sensor to chemically identify hydrogen content, achieving the same discrimination goal much faster.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If probe holes are drilled through paving to collect sufficient gas for ethane detection, then detection sensitivity is improved, but effective test time increases

Engineering Contradiction:

Improvedetection sensitivityVSAvoideffective test time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The invention extracts and measures only the hydrogen component of the gas sample using a selective hydrogen sensor, rather than performing complete chromatographic separation and analysis of all gas components. This selective extraction of the key discriminative component (hydrogen) enables rapid measurement without the time-consuming full analysis process, directly resolving the contradiction between accuracy and speed.

Inventive Principle:

Principle #2Taking out (Extraction)

3Ease of manufacture

If manual odorant detection is used for discrimination, then cost is reduced, but reliability decreases

Engineering Contradiction:

ImprovecostVSAvoidreliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The invention replaces the mechanical/chromatographic separation system with a selective chemical sensor system. Instead of using a gas chromatograph to physically separate and detect ethane, the patent uses a hydrogen-selective sensor to chemically identify hydrogen content, achieving the same discrimination goal much faster.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables rapid and reliable discrimination between utility gas and swamp gas leaks, reducing unnecessary excavations and improving the efficiency of leak surveys by using commercially available hydrogen selective sensors that do not react to decreased oxygen content.

Implementation Method 1

Employing a highly sensitive hydrogen selective gas detector that is several orders of magnitude more sensitive to hydrogen than methane

Methodology Applied

Scientific EffectHydrogen selective detection:

Data Source

PatentEP3175233B1Method and device for discrimination between natural gas and swamp gas

Publication Date: 2023.05.24 INFICON HLDG AG

Figure 1

AI summary

A method for determining whether a gas sample originates from biological processes or from a gas installation being tested and containing a utility gas is characterized in that an increased concentration of hydrogen in the sample as compared to that present in the utility gas is used as evidence that the sample originates from biological decay processes and not from the gas installation under test.